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DC-to-DC On-Board Battery Charger (30A)

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The DC-DC 30A On-Board Battery Charger is an advanced solution designed for modern 12V dual battery systems—perfect for motorhomes, campervans, caravans, and off-grid setups. Whether you're charging from a smart alternator or solar panels, this unit provides efficient, safe, and reliable charging on the move.

With upgraded features like 50V solar input capacity, enhanced heat dissipation, and support for multiple battery types including lithium, this charger offers flexibility and performance ideal for any DIY or professional installation.



Price: £233Price (inc VAT): £279.60


Why Choose the 30A DC-DC On-Board Battery Charger?


Optimised for modern touring vehicles, this charger ensures fast, safe charging of your leisure battery—whether you’re driving or parked under the sun.


  • Enhanced Efficiency: 94% charging efficiency with improved logic for faster and smarter battery charging.

  • High Solar Input: Accepts solar panel input up to 50V, perfect for larger panel arrays.

  • DIY-Friendly: Multiple wiring options make it ideal for van conversions or motorhome retrofits.

  • DC Home App Integration: Monitor and control your charging setup remotely (when paired with compatible shunt module).

  • Safe Charging: Built-in protections, temperature compensation, and low idle draw ensure safe, long-term use.



Technical Specifications


  • System Voltage: 12V → 12V

  • Input Voltage Range: 30V DC max

  • Output Voltage Range: 9 – 16V DC

  • Alternator Input:
    • Traditional: 13.2 – 16V DC
    • Smart Alternator (Euro 6): 12 – 16V DC

  • Max Output Current: 30A

  • Output Power: 400W

  • Battery Types Supported: AGM/SLD, GEL, FLD, LI, USER

  • Input/Output Fuse Rating: 75A – 100A

  • Charging Efficiency: 94%

  • Idle Consumption: <30mA



What’s Included


  • 1 x 30A DC-DC On-Board Battery Charger

Optional extras for monitoring and control:
  • Battery Temperature Sensor

  • Battery Voltage Sensor

  • IGN Signal Wire



Perfect For


  • Campervan Builds: Efficient dual battery management on the go.

  • Motorhomes: Ensure your leisure battery stays topped up during drives and idle periods.

  • Off-Grid Setups: Combine alternator and solar charging seamlessly.



Order Your DC-DC Charger Today


Upgrade your off-grid charging system with the 30A DC-DC On-Board Battery Charger. With support for solar and alternator inputs, this charger offers safe, fast and efficient battery management—wherever the road takes you.

Click “Order Now” or get in touch for help with setup or compatibility questions.

Need help? Visit our FAQs or contact our friendly support team today.


☎️ 0300 124 6982

📧 info@thehappycamperstore.co.uk